Sectional grate frame



Patented Dec. 22, 1925.

Unitas er FREDRICK P. I-IOOBER 0F HAMILTON, OHIO.

SECTIONAL GRATE FRAME.

Application filed December 4, 1923.

To all whom it may concern:

Be it known that FREDRICK P. Hoonnn, a citizen of the United States, residing at Hamilton, in the county of Butler and State of Ohio, has invented certain new and useful Improvements in Sectional Grate Frames, of which the following is a specification.

The invention relates to dump grate frames of furnaces of a well known type, in which air is supplied therethrough to the fire, so that combustion may be properly supported to the last moment before dumping.

These frames in the particular embodiment involved'are an open-boX-like form arranged to be mounted on a shaft inserted therethrough, their upper sides being closed by interchangeable and renewable grate bar tops, which are in the form of plates having corrugations and arranged in shinglelike overlapping relation.

From causes not well understood or not determined, there is frequent loss by failure of the sides of these box-like frames, and the replacement of one, aside from the cost of the part itself, involves considerable expense, usually involving removal of brickwork, and dismounting of many other parts than those to be replaced.

My invention permits the repair of this damage by the renewal of a small casting, involving in one type a weight of only about six pounds and a few minutes work, when the ordinary replacement involves the installation of a new frame weighing over a hundred pounds and the dismounting of other like frames usually, before the damaged one may be removed, in addition to breaking down the brickwork and rebuilding the same.

Additional objects, advantages and features of invention involved in the structure, arrangement and combination of parts, may be more readily understood from the following description of an instance of the embodiment of the invention, and from the accompanying drawings, in which,

Figure 1 is a cross sectional view of a frame constructed in accordance with my invention in place in a furnace, immediately adjacent and connected furnace parts only being indicated.

Figure 2 is a top'view of the frame with the grate bar tops removed, and one of my replacement elements in place at one side only.

Serial No. 678.423.

Figure 3 is an end elevation of a dumping unit assembled.

Figure 1 is a cross section at the left hand side of the unit, on the line l-4 of Figure 1.

Figure 5 is a perspective view of one of the replacement elements.

Figure 6 is a side elevation of the frame casting alone.

There is illustrated a portion of a furnace which includes a stationary grate structure- 10 and a dumping grate 11, the latter ordi narily comprising a multiplicity of laterally adjacent units assembled on a supporting shaft 12 for pivotal movement, all on the shaft being operated by a rock shaft 13 and respective arms 14 and links 15'connected to yokes 16 on the units at the lower side. Usually two sets of grates thus mounted and operated are arranged in opposed relation as dotted in Figure 1, but one only is illustrated in detail, as essential to the disclosure.

Having regard to this particular frame only, the outer or swinging edge at the left in Figure 1 may be regarded as the front thereof for the purpose of description.

The frame 17 of my dumping grate unit is substantially of the same form as heretofore constructed as to its major body portions and is constructed with similar means for mounting and for the passage of air. It likewise uses identical grate bar tops 34- as heretofore constructed. Details of the customary parts of the device will not be described except as necessary to the understanding of the invention.

The side walls of the frame 17 are formed with stepped upper edges whereby the grate bar tops may be supported properly, and each wall is formed with an opening or notch 18 extending from the upper or inner part of the first step 19, to a point intermediately of the thiid or last step 20 which is adjacent the pivoted side of the frame. The front edge 21 of the opening is perpendicular to the plane of the bottom 22 of the frame. while the rear edge 23 is curved and is ordinarily formed on a center in the plane of the upper surface of the step 20, in line with the wall and a shortdistance inward of the edge 21-that is, over the opening and near the edge 21. A recess 24 is formed in the bottom of the frame at each side, onextensive with the notch 18, and the bottom may be formed with an offset 25 to accommodate this recess.

The rear side of the notch 18 forms the forward edge of the inset wall part 26 of the side of the frame, formed to accommo date dump grate brackets (not shown) by which the shaft 12 is mounted. This rear side of the notch 18 therefore is located a distance inwardly beyond the plane of the major outer or forward part of the side wall (in the ordinary form about one and onehalf 'nches).

The bottom 22 of the recess is extended laterally outward beyond the wall part 26 at right angles thereto to a projection of the plane of the forward part of the side of the frame, as at 27 in Figure 2, forming a rectangular corner. This may not be found essential and the particular extent of th1s bottom of the recess and its contour may be modified as found desirable.

A side section or replacement piece 28 is fitted in the notch 18, having the same form as viewed fronji the side. whereby it may fit snugly therein and form a continuation of the side wall of the frame. The section 28 comprises a wall 29 and a bottom flange 30, adapted to lit in the recess Q-l. This flange and the bottom of the frame may be apertured to receive bolts for securement of the section 28 to the frame, as indicated. At its rear part an integral curved wall 31 is formed thereon adapted to rest snugly against the rear curved edge 23 of the notch 18, extending inwardly from the wall 29 to the inner edge of the flange 30, which alines with the inner face of the inset wall part 26. The upper edge of the wall 29 is provided with a forward second step part 32 which is adapted to stand intermediately in height between the first step 19 of the wall of the frame 17 and, the third step 20 before mentioned, while the rear upper edge of the wall 29 formsva forward continuation of the said third step. Inwardly projecting flanges-33 areformed on each of these step parts of the replacement piece,,adapted to afford ready support for respective grate bar tops as shown.

It should be noted that by forming the rear of the notch 18 with the curve as noted, ready introduction of a new part after damage of the previous one is greatly facilitated. and a rigid fit as well as a tight closure insured when the bolts holding the piece are tightened. It is an advantage of the device also, that in the event of breaking down of a side wall, the fastenings of the grate bar tops 34 may be difficult to remove, and necessity therefor is obviated, they are in the part to be discarded. The replacement part renews the fasteningflanges, so that: the work of fastening new grate bar tops is correspondingly facilitated.v

The replacement parts-28 for the two sides are similar, except that their elements are re versed so that they will fit opposite sides'of the rame The. ame and repla ement parts 28 are adapted to be produced readily by familiar practice and thecomplete frame in my construction costs but a fraction more than the ordinary one, while the replacement part costs only a small fraction of that of the old frame. However, the difference in labor costs for replacement is the principalvalue of the device, although it is estimated that the number of replacements on each frame will ultimately represent a substantial saving-even, in the cost of parts.

lt. should be noted that the curve of the surface 23 adjacent wall l!) and. thereabove.

I claim;

1. In a dumping grate of the character described, a supporting frame comprising a bottom having a narrow part provided with integral parallel side walls and a broader part provided with side walls off- (mtward from the first named side walls and spaced therefrom, side pieces including walls allning with and abutting thesecond named side walls, respectively, and integral transverse parts abutting the ends of. the first named side walls respectively, each said side piece including an integral base plate joined to the wall and transverse part thereor and lying in over-lapped relation to the bottom of the frame, and fastening means engaging the base plate and bottom of the frame,-

2. The structure of claim l 'in which each first named side wall is formed with its edge next the side piece sloping at an obtuse at the end of each wall 26 has' its center at or beyond the inner end of theangle to the bottom, and said transverse part of the side piece is shaped to litthe sloping edge. I

3, The structure of claim 1 in which each first named wall, is formed with its edge next the side pieces curved on a center ad,- jacent or. beyond the inner extremity of the adjacent second named side wall, and said transverse part is shaped to lit the curved edge.

at. A dumping grate. comprising a frame including a bottom having a narrow part provided with integral side walls, a broader part having side walls offset: outwardly from the first named sidewalls and spaced therefrom, side pieces including walls alining with-and abutting the second named side walls respectively, and integral transverse parts abutting theiends of the first named side walls respectively, each side piece including an integral base plate joined to the wall and transverse part thereof and lying in overlapped relation to the bottom of the frame,v fastening means engaging the base plate and bottom of the frame, and grate bars upon; the uppersides of the said walls.

In testimony whereof I aflix my signature.

FREDRICK P. HOOBER. 

